> The MPLAB 8 series has a processor definition file I'll have a look for it. The vast majority of the s/w for that project had been done, adding INT0 was the last little bit. > - is there a reason you are not using 8.92, the last version? No, not really. Just haven't updated. If 8.92 is OK then it's probably time to. This is the first issue I've had with 8.56 so saw no reason to change. I've got several projects for the 14K22 which use interrupts and having to edit the hex file to disable debug if I stick with 8.56 is going to get old pretty quick Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7752 / Virus Database: 4649/12951 - Release Date: 09/05/16 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .